甜菜原种生产是育种工作的继续,它通过田间选择和室内选择相结合的方法选优去劣,选出优选母根繁殖原原种种子,作为培育原种母根用种,并保存品种;选岀普选母根繁殖原种种子,作为生产种母根培育用种,籍以保持和加强优良品种的优良性状。据国外资料,甜菜原种无选择繁殖一代,其后代根产量降低4.2%,含糖不变;繁殖两代,根产量降低5.6%,含糖降 The production of sugar beet seed is the continuation of breeding work. It selects the best original seed of mother seed through the combination of field selection and indoor selection, Select 岀 general election mother seed breeding seed, as a breeding species of parent breeding, membership in order to maintain and enhance the fine traits of fine traits. According to foreign data, there is no choice of breeding beet seed generation generation, its offspring yield reduced 4.2%, the same sugar; breeding two generations, the root yield decreased by 5.6%, sugar